Add step to restart services

Author: Akshay Gadhave

guides/common/modules/proc_upgrading-postgresql-on-the-external-database-system.adoc

@@ -20,6 +20,12 @@ Instead of enabling the `postgresql:13` module, switch to the module:
 # yum module switch-to postgresql:13
 ----
 . Restore the `/var/lib/pgsql/data/postgresql.conf` and `/var/lib/pgsql/data/pg_hba.conf` files from the backup.
+. Restart {Project} services:
++
+[options="nowrap", subs="+quotes,verbatim,attributes"]
+----
+# {foreman-maintain} service restart
+----
 ifdef::katello,satellite,orcharhino[]
 . Correct the permissions on the `evr` extension on the external database:
 +